Originally Posted by Hailers

Originally Posted by Hailers

I have a 2007 XK and assume it's engine is similar to your i.e. I'm guessing.

I had an overheat problem that happened only when I pulled to a stop after driving. I suspected the thermostat and removed the thermostat cover. I then discovered that the coolant outlet assy was broken internally causing the water from the water pump to not pass fully thru the radiator therefore causing an overheat problem at idle.

I've a couple of threads on the XK forum on this. This is as far as I care to go with this right now. The plastic coolant outlet assy cost me approx 150 bucks give or take. This from memory. A new water thermo sensor and thermostat were part of the coolant outlet assy I bought.

Just pull off the thermostat cover and take a look. The thermostat is a part of the cover. It's clocked into that cover. The part of the outlet assy that was broken was a molded pipe that makes with the butt end of the thermostat. The large broken off piece of the outlet assy allowed water that had already passed thru the engine, to bypass the radiator and return directly to the water pump inlet i.e. not much cooling being done that way.